Not being taildragger qualified, I can only offer an opinion from the viewpoint of OBSERVING these a/c.
I'd vote for an observer to help guide the pilot. Maybe walking beside the a/c until it has reached the "hold" line and can be cleared by ground control to move onto the runway.
The observer could either walk beside the a/c at the wingtip or be posted as stationary guides at certain intervals to keep proper spacing between the a/c.
Ground control could allow only as many a/c on the taxi-way as there are guides to direct them. Not sure about the logistics of this idea but you didn't ask me to solve it. Just to voice an opinion.
Like I said...a layman's opinion only.
Mudge the novice
